<template>
  <div class="home-category" @mouseleave="categoryId = ''">
    <!-- 左侧菜单 -->
    <ul class="menu">
      <li
        v-for="item in menuList"
        :key="item.name"
        @mouseenter="categoryId = item.id"
        :class="{ active: categoryId && categoryId === item.id }"
      >
        <RouterLink :to="`/category/${item.id}`">{{ item.name }}</RouterLink>
        <RouterLink
          v-for="item2 in item.children"
          :key="item2.id"
          :to="`/category/sub/${item.id}`"
        >
          {{ item2.name }}
        </RouterLink>
        <template v-if="!item.children">
          <XtxSkeleton bg="rgba(255,255,255,0.3)" width="60px" height="18px" style="margin-right:10px"></XtxSkeleton>
          <XtxSkeleton bg="rgba(255,255,255,0.3)" width="60px" height="18px"></XtxSkeleton>
        </template>
      </li>
    </ul>
    <!-- 弹层 -->
    <div class="layer">
      <h4>{{ currCategory && currCategory.goods ? '分类' : '品牌'  }}推荐<small>根据您的购买或浏览记录推荐</small></h4>
      <!-- 第一个 ul 是分类列表 -->
      <ul v-if="currCategory && currCategory.goods">
        <li v-for="item in currCategory.goods" :key="item.id">
          <RouterLink :to="`/product/${item.id}`">
            <img :src="item.picture" alt="" />
            <div class="info">
              <p class="name ellipsis-2">{{ item.name }}</p>
              <p class="desc ellipsis">{{ item.desc }}</p>
              <p class="price"><i>¥</i>{{ item.price }}</p>
            </div>
          </RouterLink>
        </li>
      </ul>
      <!-- 第二个 ul 是品牌列表 -->
      <ul v-if="currCategory && currCategory.brands">
        <li class="brand" v-for="item in currCategory.brands" :key="item.id">
          <RouterLink to="/">
            <img :src="item.picture" alt="">
            <div class="info">
              <p class="place"><i class="iconfont icon-dingwei"></i>{{ item.place }}</p>
              <p class="name ellipsis">{{ item.name }}</p>
              <p class="desc ellipsis-2">{{ item.desc }}</p>
            </div>
          </RouterLink>
        </li>
      </ul>
    </div>
  </div>
</template>

<script>
import { computed, reactive, ref } from 'vue'
import { useStore } from 'vuex'
import { findHomeBrand } from '@/api/category'
export default {
  name: 'HomeCategory',
  setup () {
    const store = useStore()

    // 品牌数据自己准备，自己添加上去
    const brand = reactive({
      id: 'brand',
      name: '品牌',
      children: [{ id: 'brand-chilren', name: '品牌推荐' }],
      brands: []
    })

    findHomeBrand().then(({ result }) => {
      // console.log(result)
      brand.brands = result
    })

    // 计算数据内部处理数据
    const menuList = computed(() => {
      // 处理从 VueX 取出来的数据
      const arr = store.state.category.list.map(item => ({
        ...item,
        // children 字段只需要前两个即可，&& 写法用于防止报错
        children: item.children && item.children.slice(0, 2)
      }))
      arr.push(brand)
      // 返回最终处理结果
      return arr
    })

    // 选中分类id
    const categoryId = ref('')
    // 选中分类
    const currCategory = computed(() => {
      return menuList.value.find(item => item.id === categoryId.value)
    })

    // console.log(menuList)
    // 返回给模板使用的数据
    return { menuList, categoryId, currCategory }
  }
}
</script>

<style scoped lang="less">
.home-category {
  width: 250px;
  height: 500px;
  background: rgba(0, 0, 0, 0.8);
  position: relative;
  z-index: 99;
  .menu {
    li {
      padding-left: 40px;
      height: 50px;
      line-height: 50px;
      // 鼠标悬停 li 的时候，背景变色
      &:hover, &.active {
        background: @xtxColor;
      }
      a {
        margin-right: 4px;
        color: #fff;
        &:first-child {
          font-size: 16px;
        }
      }
    }
  }
  &:hover {
    .layer {
      display: block;
    }
  }
  .layer {
    width: 990px;
    height: 500px;
    background: rgba(255, 255, 255, 0.8);
    position: absolute;
    left: 250px;
    top: 0;
    display: none;
    padding: 0 15px;
    h4 {
      font-size: 20px;
      font-weight: normal;
      line-height: 80px;
      small {
        font-size: 16px;
        color: #666;
      }
    }
    ul {
      display: flex;
      flex-wrap: wrap;
      li.brand {
        height: 180px;
        a {
          align-items: flex-start;
          img {
            width: 120px;
            height: 160px;
          }
          .info {
            p {
              margin-top: 8px;
            }
            .place {
              color: #999;
            }
          }
        }
      }
      li {
        width: 310px;
        height: 120px;
        margin-right: 15px;
        margin-bottom: 15px;
        border: 1px solid #eee;
        border-radius: 4px;
        background: #fff;
        &:nth-child(3n) {
          margin-right: 0;
        }
        a {
          display: flex;
          width: 100%;
          height: 100%;
          align-items: center;
          padding: 10px;
          &:hover {
            background: #e3f9f4;
          }
          img {
            width: 95px;
            height: 95px;
          }
          .info {
            padding-left: 10px;
            line-height: 24px;
            width: 190px;
            .name {
              font-size: 16px;
              color: #666;
            }
            .desc {
              color: #999;
            }
            .price {
              font-size: 22px;
              color: @priceColor;
              i {
                font-size: 16px;
              }
            }
          }
        }
      }
    }
  }
}
</style>
